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I just got done doing a disc brake conversion and pulled a full quart of fluid through the system using my Mity-Vac (8 oz. per wheel) and still have air in the system. The Mighty-Vac has failed me the last few times I tried it. I think what is happening is the vacuum is pulling air in around the threads of the loosened bleeder screw.

Went and borrowed a pressure bleeder and all is well.

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The vacuum method is just hooking a hand vacuum pump(mighty vac) to the open bleeder and start pumping until no more air comes out with the fluid. Just be sure to keep the master filled. When you stop pumping to refill the master close the bleeder.

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Are you saying just connect the hand vacuum pump directly up to the bleeder without a jar in the middle? Wouldn't that ruin the pump when the fluid comes out?

How about this..would this be right...

- Fill MC and leave cap off
- Hook up vacuum pump hose to jar cap
- Hook up short hose bottom of jar cap into a couple of inches of fluid
- Hook up other hose from jar cap to bleeder
- open bleeder and start pumping until no more bubbles in fluid in jar and hose to bleeder is full of fluid
- close bleeder and move on to next wheel

Is that right?

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ok guys, here's what i did with the restoration on my Challenger.

after i attached all the brake lines in my challenger. i filled the MC with brake fluid, yes, i didn't bench bleed it. slowly pumped the pedal about 3 or 4 times, refilled the MC and let it set for 3 days. went back, made sure the level was correct in the MC, then connected one of those hand vacuum pumps to the wheel cylinders starting at the RR, LR, RF, LF, just slowly pulling brake fluid into the reservoir. each time making sure the level was correct in the MC. then i left it for 3 more days. when i went back, the brakes were perfect. i have drums all the way around and it didn't even pull a little bit.

if you can, let it sit. the air bubbles will work themselves out.

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On the hand held vacuum pump method (the one you squeeze to create vacuum and draw fluid). I'm assuming you used the jar. I have one but the directions suck.

I put one hose from hand pump to jar lid...one small hose from lid into jar...and one hose from other end of jar cap to bleeder valve. Now what?

Do I add fluid in the jar? Do I leave the bleeder open while I pump...or create vacuum then open bleeder then close and on and on? Is the MC lid on or off when vacuum bleeding?

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